Two-dimensional colloidal nanostructures: Synthesis and electrical transport

DIPC Seminars

Christian Klinke, University of Hamburg, Germany
Donostia International Physics Center (DIPC).Paseo Manuel de Lardizabal, 4, Donostia
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Two-dimensional colloidal nanostructures: Synthesis and electrical transport Coulomb blockade and oscillations had been observed in individual nanoparticles (e.g. Andres et al., Science 272 (1996) 1323; Klein et al., Appl. Phys. Lett. 68 (1996) 2574). In my talk I will demonstrate that by means of a local top-gate current oscillations can be observed also in extended, monolayered films assembled from monodisperse metal nanocrystals - realizing transistor function. The oscillations in this metal-based system are due to the occurrence of a Coulomb energy gap in the nanocrystals which is tunable via the nanocrystal size. Further, I will show that the formation of ordered and densely packed ligand surface layers of oleic acid on {100} PbS surfaces can drive the normally isotropic crystal growth into a two-dimensional oriented attachment of nanocrystals. Hereby the presence of chlorine containing co-solvents during the initial nucleation and growth process of the nanocrystals plays a prominent role. The synthesis and the formation mechanism will be discussed, as well as first electrical applications. **Biography** Christian Klinke studied physics at the University of Karlsruhe (now Karlsruhe Institute of Technology (KIT), Germany). In March 2000 he joined, as PhD student, the group of Klaus Kern at the Institute of Experimental Physics of the EPFL (Lausanne, Switzerland). Then from 2003 on he worked as Post-Doc at the IBM TJ Watson Research Center (Yorktown Heights, USA) in the group of Phaedon Avouris. In 2006 then he became member of the Horst Weller group at the University of Hamburg (Germany). Since 2007 he is Assistant Professor at the University of Hamburg. In 2009 he received the German Nanotech Prize (Nanowissenschaftspreis, AGeNT-D/BMBF). His research is supported by an ERC Starting Grant 2012. In 2013 he obtained a Heisenberg fellowship of the German Funding Agency DFG. In his group phenomena are investigated emerging in novel solid state materials with dimensions in the nanometer range. Such materials are generated by colloidal synthesis, chemical vapor deposition, and electron- beam lithography. The nanostructures are characterized by means of electrical transport measurements, spectroscopical methods, and electron microscopy. Of special interest are the electrical properties of inorganic nanoparticles, carbon nanotubes, and hybrid nanostructures.